ci(release): derive prerelease publication channel

Derive the NIP-82 channel from the first prerelease identifier in the tagged version, while retaining main for stable versions. Pass the result explicitly to ngit so rc, beta, and similarly named channels are not mislabeled by the manifest default.

The application metadata and publication targets are unchanged. This deliberately does not trigger or otherwise rehearse a production release.

Validated with actionlint, yq, git diff --check, and stable/rc/beta/nightly derivation examples.

.ngit/act/workflows/release.yaml

@@ -74,6 +74,12 @@ jobs:
           printf '%s\n' "$NGIT_PUBLISHER_NBUNKSEC" > "$signer_file"
 
           version="${GITHUB_REF_NAME#v}"
+          if [[ "$version" == *-* ]]; then
+            prerelease="${version#*-}"
+            channel="${prerelease%%[.+]*}"
+          else
+            channel=main
+          fi
           released_at="$(git for-each-ref \
             --format='%(creatordate:unix)' \
             "refs/tags/$GITHUB_REF_NAME")"
@@ -84,6 +90,7 @@ jobs:
           ngit release publish "$version" \
             --repo nostr://npub15qydau2hjma6ngxkl2cyar74wzyjshvl65za5k5rl69264ar2exs5cyejr/relay.ngit.dev/ngit-grasp \
             --manifest .ngit/release.yaml \
+            --channel "$channel" \
             --tag "$GITHUB_REF_NAME" \
             --released-at "$released_at" \
             --nbunksec-file "$signer_file" \

.ngit/release.yaml

@@ -19,7 +19,6 @@ license: MIT
 website: https://gitworkshop.dev/danconwaydev.com/ngit-grasp
 repository: nostr://npub15qydau2hjma6ngxkl2cyar74wzyjshvl65za5k5rl69264ar2exs5cyejr/relay.ngit.dev/ngit-grasp
 icon: static/icon.png
-channel: main
 release_notes: CHANGELOG.md
 publication:
   blossom_servers: